SOLARNET Conference: The Many Scales of the Magnetic Sun

Recent ultraviolet observations performed by the IRIS satellite have shown the occurrence of small-scale eruptive phenomena, characterized by significant increase of the integrated line intensity (up to a factor of 100 in Si IV lines) and of the line width (up to ± 100 km s$^{-1}$), likely due to magnetic reconnection. Some of these events also exhibit counterpart in all the SDO/AIA channels.
We report on a series of similar events observed during secondary flux emergence in an arch filament system in active region NOAA 12585. We use high-resolution observations acquired by SST/CRISP relevant to the photosphere and the chromosphere to characterize the magnetic field configuration and the phenomena occurring in the low atmosphere. IRIS and SDO/AIA observations reveal the atmospheric response and the presence of heating and plasma ejection activity in the upper atmosphere.